[libclang] Simplify annotation of preprocessing tokens and remove the AnnotateTokensData

DenseMap and the lookups associated with it.

Instead of lexing for preprocessor tokens, associating the annotation with the location in a map,
and later lookup in the map in order to adjust the cursor annotation, just annotate the cursor
while lexing for preprocessor tokens.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171775 91177308-0d34-0410-b5e6-96231b3b80d8